Graphene Oxide–Supported Cobalt Phthalocyanine as Heterogeneous Catalyst to Activate Peroxymonosulfate for Efficient Degradation of Norfloxacin Antibiotics
Publication: Journal of Environmental Engineering
Volume 144, Issue 7
Abstract
Developing highly potent and environmentally friendly catalysts to activate peroxymonosulfate (PMS) to generate reactive species has received considerable and increasing attention in the field of antibiotics elimination. In the present work, cobalt phthalocyanine (CoPc) supported by graphene oxide (GO) was prepared and used as a heterogeneous catalyst to activate PMS to generate hydroxyl and sulfate radicals for effective degradation of norfloxacin (NOR) in water. In this study, the CoPc/GO/PMS system had the advantages of the excellent performance of sulfate radicals generation and the reduction of cobalt leaching by the catalytic effect of GO delocalizing electrons. The optimum conditions for NOR degradation were 2.0% by weight CoPc/GO, catalyst dosage of , pH of 7, and PMS addition of . The analysis of intermediates indicated that the piperazinyl ring and fluorine atom of NOR were attacked by and originating from CoPc activation in the CoPc/GO/PMS system. However, anions such as , , and in a natural water environment could inhibit the generation of reactive radicals, greatly affecting the removal of NOR. Meanwhile, the degradation mechanisms of NOR, including intermediate products, degradation pathways, and active species, were analyzed via liquid chromatography-mass spectrometer (LC-MS). It is believed that this work will promote the development of advanced oxidation technology based on PMS activation and the application of a heterogeneous catalyst in water treatment.
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Acknowledgments
We acknowledge the financial support from National Natural Science Foundation of China (No. 51578249), the Science and Technology Planning Project of Guangdong Province (No. 2015A020215028), and Natural Science Foundation of Guangdong Province (No. 2016A030313434).
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Published In
Journal of Environmental Engineering
Volume 144 • Issue 7 • July 2018
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©2018 American Society of Civil Engineers.
History
Received: Aug 9, 2017
Accepted: Jan 29, 2018
Published online: May 10, 2018
Published in print: Jul 1, 2018
Discussion open until: Oct 10, 2018
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